12000 series plexi replica review online

Koa-dogg · Post by **Koa-dogg** » Wed Nov 16, 2005 11:14 am

Maybe its just a resistor? Possibly use a lower resistor to feed the bias supply (Resistor before the diode) to control the bias for the 400V's and when you switch to 500V it also switches another resistor in line to handle the increased voltage. Just a guess....

Billy Batz · Post by **Billy Batz** » Wed Nov 16, 2005 11:20 am

I dont think thats it. I have a good idea but Im not saying in case its right

Koa-dogg · Post by **Koa-dogg** » Wed Nov 16, 2005 12:05 pm

I'm not that experienced with electronics, but would that not work?

Tatosh · Post by **Tatosh** » Wed Nov 16, 2005 12:06 pm

Just when I think that I have set my mind on what I am getting from George!!!

Anyway, that amp absolutely rocks, and of course, I am more than a little curious about the voltage thing. Is that a normal transformer with a special mod, or that dual tap one that Rockstah just got? (I was under the impression that that particular tranny allowed different voltages, but I might be wrong.)

Koa-dogg · Post by **Koa-dogg** » Wed Nov 16, 2005 12:06 pm

I'm not that experienced with electronics, but would that not work?

Post by **VelvetGeorge** » Wed Nov 16, 2005 12:07 pm

It is a dual secondary PT with some extra switching compnents. The voltage change is all a product of the PT.

George

rockstah · Post by **rockstah** » Wed Nov 16, 2005 1:13 pm

What are the 4 big cans 100uf but what kind? f&t's? and what value is on top?

Post by **VelvetGeorge** » Wed Nov 16, 2005 1:56 pm

The large cans are F&T single 100uf, the cap on top is a single 32uf.

george

Billy Batz · Post by **Billy Batz** » Wed Nov 16, 2005 1:58 pm

any reason why you keep using the 100u cans instead of hte axials?

rockstah · Post by **rockstah** » Wed Nov 16, 2005 2:02 pm

VelvetGeorge wrote:The large cans are F&T single 100uf, the cap on top is a single 32uf.

george

coolness -my amp has 2 100uf and 2 33uf
i have a f&t 32+32uf can cap for top
can i use this can for 32, 16 and 64? one side, parallel or series right?
or is it only good for 32 or 16?

Post by **VelvetGeorge** » Wed Nov 16, 2005 2:08 pm

oops, forgot which amp I was talking about. That one does have the dual 50 cans. I didn't have the axials in stock yet. I prefer the single 100 cans.

You can use the dual 32 can for 32 or 64. Not 16 since the grounds are common to both sections.

George

rockstah · Post by **rockstah** » Wed Nov 16, 2005 2:10 pm

VelvetGeorge wrote:oops, forgot which amp I was talking about. That one does have the dual 50 cans. I didn't have the axials in stock yet. I prefer the single 100 cans.

You can use the dual 32 can for 32 or 64. Not 16 since the grounds are common to both sections.

George

thanks George!

VHoholic · Post by **VHoholic** » Wed Nov 16, 2005 2:42 pm

Hey George, compliments again on your new 12000 series amp! The thing is a beauty. Quick question, in the LegendaryTones review it says that the the “Dual Voltage mod” set to 500volts will get you in VH territory just as if you had placed a Variac inside. I've always used a Variac to lower the volume on my cranked Marshalls so i'm wondering how it would sound if, along with the 500volt setting, the amp was still plugged into a variac and lowered even more to get the volume down further?

Post by **VelvetGeorge** » Wed Nov 16, 2005 2:55 pm

I love the way your mind works!

The 400V setting is the virtual variac setting. And since the heaters are working normally at 6.3V you could variac the amp down to the typical 90 volt range.

At 30% lower input the B+ would drop to just under 300 volts!

The only issue would be that the preamp voltage would now be so low that you would have very little linear operating range. Resulting in lots of distortion. Whether it's the good kind of distortion is up to you.

Bottom line, yes this would work.

george

rockstah · Post by **rockstah** » Wed Nov 16, 2005 3:05 pm

VHoholic wrote:Hey George, compliments again on your new 12000 series amp! The thing is a beauty. Quick question, in the LegendaryTones review it says that the the “Dual Voltage mod” set to 500volts will get you in VH territory just as if you had placed a Variac inside. I've always used a Variac to lower the volume on my cranked Marshalls so i'm wondering how it would sound if, along with the 500volt setting, the amp was still plugged into a variac and lowered even more to get the volume down further?

i think you need to reread it - its the 400v position that gets you the variaced evh territory